Migrants riding an inflatable boat approach the Greek island of Kos after crossing a part of the Aegean Sea between Turkey and Greece on August 13, 2015. Greece sent extra riot police to Kos as tensions mounted over a huge influx of migrants. The Greek government said it was “immediately” dispatching a ship to Kos to double up as an accommodation and processing centre for up to 2,500 people as around 7,000 migrants wait to apply for immigration papers. AFP PHOTO / ANGELOS TZORTZINIS (Photo credit should read ANGELOS TZORTZINIS/AFP/Getty Images)